Finding an AMD mobo that supports SLI, SLI used to be more exsclusive to AMD mobo's. It sucks that my Asus P5E having two 16x PCI-Express 2.0 can't run SLI.

I wish Intel would buy out Nvidia, can you imagine the competitiveness from Intel/Nvidia vs AMD/ATI? As for being able to run SLI which is far better than the buggy nature of CrossFire, but that would mean that you have to get an Nvidia based mobo (EVGA 680i A1 is best) utilising SLI is the way to go.
Nvidia has always been one step ahead for duel graphics cards, first out with better drivers than their rival. I remember when Oblivion first came out, there was an issue with how self shadows were cast wrong and Nvidia shortly came out with a fix a few weeks later. It took 8 months later for ATI to finely fix their driver problem, that didn't make ATI look very good.
The X38 is the best performer, just have a look at the 50 reviews at NewEgg theres not one board that failed to work out of 50! Asus has had many problems with their P35 base mobo's rebooting in the middle of apps, games and just about anything you can think of. Just have a look at NewEgg or Asus's own forums with all the horror stories.
The mobo chipsets comunicate with the processer because of the memory controller being in the chipset instead of on the processers die like AMD has been doing for sometime. Don't judge a processers by these on die memory controller because at the end of the day Intel's perform & overclock way better than an AMD. I am not trying to change your prefference or anything just giving you facts. If you have anymore questions please ask.